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-rw-r--r--nusmuk-audio/bq~.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/nusmuk-audio/bq~.c b/nusmuk-audio/bq~.c
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+++ b/nusmuk-audio/bq~.c
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+/* Copyright (c) 1997-1999 Miller Puckette.
+* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
+
+// modification of this code by cyrille henry in order to change the biquad topology and add audio inlet for filter coefs
+
+#include "m_pd.h"
+#include <math.h>
+
+/* ---------------- bq~ - raw bq filter ----------------- */
+
+typedef struct bqctl
+{
+ t_sample c_x1;
+ t_sample c_x2;
+ t_sample c_y1;
+ t_sample c_y2;
+} t_bqctl;
+
+typedef struct bq_tilde
+{
+ t_object x_obj;
+ t_float x_f;
+ t_bqctl x_cspace;
+ t_bqctl *x_ctl;
+} t_bq_tilde;
+
+t_class *bq_tilde_class;
+
+static void *bq_tilde_new(t_symbol *s, int argc, t_atom *argv)
+{
+ t_bq_tilde *x = (t_bq_tilde *)pd_new(bq_tilde_class);
+ inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+ inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+ inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+ inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+ inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+ outlet_new(&x->x_obj, &s_signal);
+ x->x_ctl = &x->x_cspace;
+ x->x_cspace.c_x1 = x->x_cspace.c_x2 = 0;
+ x->x_cspace.c_y1 = x->x_cspace.c_y2 = 0;
+ x->x_f = 0;
+ return (x);
+}
+
+static t_int *bq_tilde_perform(t_int *w)
+{
+ t_sample *in = (t_sample *)(w[1]);
+ t_sample *ina1 = (t_sample *)(w[2]);
+ t_sample *ina2 = (t_sample *)(w[3]);
+ t_sample *inb1 = (t_sample *)(w[4]);
+ t_sample *inb2 = (t_sample *)(w[5]);
+ t_sample *inb3 = (t_sample *)(w[6]);
+ t_sample *out = (t_sample *)(w[7]);
+ t_bqctl *c = (t_bqctl *)(w[8]);
+ int n = (t_int)(w[9]);
+ int i;
+ t_sample last_in = c->c_x1;
+ t_sample prev_in = c->c_x2;
+ t_sample last_out = c->c_y1;
+ t_sample prev_out = c->c_y2;
+
+ for (i = 0; i < n; i++)
+ {
+ t_sample output = *inb1++ * *in + *inb2++ * last_in + *inb3++ * prev_in - *ina1++ * last_out - *ina2++ * prev_out;
+// if (PD_BIGORSMALL(output))
+// output = 0; i don't understnd why it did not compile with this 2 lines.
+// should be fixed latter if denormal is a problem
+ *out++ = output;
+ prev_in = last_in;
+ prev_out = last_out;
+ last_out = output;
+ last_in = *in++;
+ }
+ c->c_x1 = last_in;
+ c->c_x2 = prev_in;
+ c->c_y1 = last_out;
+ c->c_y2 = prev_out;
+
+ return (w+10);
+}
+
+static void bq_tilde_set(t_bq_tilde *x, t_symbol *s, int argc, t_atom *argv)
+{
+ t_bqctl *c = x->x_ctl;
+ c->c_x1 = atom_getfloatarg(0, argc, argv);
+ c->c_x2 = atom_getfloatarg(1, argc, argv);
+ c->c_y1 = atom_getfloatarg(2, argc, argv);
+ c->c_y2 = atom_getfloatarg(3, argc, argv);
+}
+
+static void bq_tilde_dsp(t_bq_tilde *x, t_signal **sp)
+{
+ dsp_add(bq_tilde_perform, 9,
+ sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec, sp[4]->s_vec,
+ sp[5]->s_vec, sp[6]->s_vec, x->x_ctl, sp[0]->s_n);
+
+}
+
+void bq_tilde_setup(void)
+{
+ bq_tilde_class = class_new(gensym("bq~"), (t_newmethod)bq_tilde_new,
+ 0, sizeof(t_bq_tilde), 0, A_GIMME, 0);
+ CLASS_MAINSIGNALIN(bq_tilde_class, t_bq_tilde, x_f);
+ class_addmethod(bq_tilde_class, (t_method)bq_tilde_dsp, gensym("dsp"), 0);
+ class_addmethod(bq_tilde_class, (t_method)bq_tilde_set, gensym("set"),
+ A_GIMME, 0);
+ class_addmethod(bq_tilde_class, (t_method)bq_tilde_set, gensym("clear"),
+ A_GIMME, 0);
+}
+
+